Java Queue MCQs with answers Page - 3

You will find multiple-choice questions (MCQs) related to #Java Queue here. Go through these questions to prepare effectively for your upcoming exams and interviews.

To view the correct answer for any question, simply click the "Show Answer" button.

Have a question to share? Click on "Add Question" to contribute!

A

Admin • 828.43K Points
Coach

Q. What happens when you call `remove()` on an empty queue?

  • (A) Returns null
  • (B) Throws NoSuchElementException
  • (C) Throws NullPointerException
  • (D) Does nothing

A

Admin • 828.43K Points
Coach

Q. Which method removes and returns the head of a BlockingQueue, waiting if necessary?

  • (A) poll()
  • (B) remove()
  • (C) take()
  • (D) get()

A

Admin • 828.43K Points
Coach

Q. Which class implements both Deque and Queue interfaces?

  • (A) PriorityQueue
  • (B) ArrayDeque
  • (C) BlockingQueue
  • (D) TreeMap

A

Admin • 828.43K Points
Coach

Q. What does `offer(e, timeout, unit)` do in a BlockingQueue?

  • (A) Adds an element if possible, waiting up to timeout
  • (B) Always adds the element
  • (C) Throws exception if full
  • (D) Blocks indefinitely

A

Admin • 828.43K Points
Coach

Q. Which method retrieves and removes the head, or waits if necessary?

  • (A) poll()
  • (B) element()
  • (C) take()
  • (D) next()

A

Admin • 828.43K Points
Coach

Q. Which of the following queues has capacity of zero?

  • (A) LinkedBlockingQueue
  • (B) ArrayBlockingQueue
  • (C) SynchronousQueue
  • (D) PriorityQueue

A

Admin • 828.43K Points
Coach

Q. Which queue class is most appropriate for LIFO (stack-like) behavior?

  • (A) ArrayDeque
  • (B) PriorityQueue
  • (C) LinkedBlockingQueue
  • (D) ConcurrentLinkedQueue

A

Admin • 828.43K Points
Coach

Q. Which method in BlockingQueue adds an element, waiting indefinitely if full?

  • (A) add()
  • (B) put()
  • (C) offer()
  • (D) push()

A

Admin • 828.43K Points
Coach

Q. What does `drainTo()` method do in BlockingQueue?

  • (A) Transfers elements to another collection
  • (B) Deletes all elements
  • (C) Returns first element only
  • (D) Blocks until empty

A

Admin • 828.43K Points
Coach

Q. What type of queue is a `ConcurrentLinkedQueue`?

  • (A) Blocking and thread-safe
  • (B) Non-blocking and thread-safe
  • (C) Unordered and unsafe
  • (D) Blocking and unsafe

Browse More Tags

Click on tag to learn MCQs of that tag.
What's Tag

As you may know, questions are organized under broad categories. Each category can include various types of questions. For example, the "History" category might contain questions about the Revolt of 1857, Shivaji Maharaj, Ancient History, Buddhism, and more.

To further refine this organization, we've introduced tags, which act as sub-categories to group questions more specifically.

Verified users can add tags to any question. If you have any suggestions regarding this system, we'd love to hear from you. Contact Us

Learn More